llvm-6502/include/llvm/CodeGen/CommandFlags.h
Rafael Espindola e0a2541eb7 Add r228980 back.
Add support for having multiple sections with the same name and comdat.

Using this in combination with -ffunction-sections allows LLVM to output a .o
file with mulitple sections named .text. This saves space by avoiding long
unique names of the form .text.<C++ mangled name>.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@229541 91177308-0d34-0410-b5e6-96231b3b80d8
2015-02-17 20:48:01 +00:00

306 lines
12 KiB
C++

//===-- CommandFlags.h - Command Line Flags Interface -----------*- C++ -*-===//
//
// The LLVM Compiler Infrastructure
//
// This file is distributed under the University of Illinois Open Source
// License. See LICENSE.TXT for details.
//
//===----------------------------------------------------------------------===//
//
// This file contains codegen-specific flags that are shared between different
// command line tools. The tools "llc" and "opt" both use this file to prevent
// flag duplication.
//
//===----------------------------------------------------------------------===//
#ifndef LLVM_CODEGEN_COMMANDFLAGS_H
#define LLVM_CODEGEN_COMMANDFLAGS_H
#include "llvm/MC/MCTargetOptionsCommandFlags.h"
#include "llvm/Support/CodeGen.h"
#include "llvm/Support/CommandLine.h"
#include "llvm/Target/TargetMachine.h"
#include "llvm/Target/TargetOptions.h"
#include <string>
using namespace llvm;
cl::opt<std::string>
MArch("march", cl::desc("Architecture to generate code for (see --version)"));
cl::opt<std::string>
MCPU("mcpu",
cl::desc("Target a specific cpu type (-mcpu=help for details)"),
cl::value_desc("cpu-name"),
cl::init(""));
cl::list<std::string>
MAttrs("mattr",
cl::CommaSeparated,
cl::desc("Target specific attributes (-mattr=help for details)"),
cl::value_desc("a1,+a2,-a3,..."));
cl::opt<Reloc::Model>
RelocModel("relocation-model",
cl::desc("Choose relocation model"),
cl::init(Reloc::Default),
cl::values(
clEnumValN(Reloc::Default, "default",
"Target default relocation model"),
clEnumValN(Reloc::Static, "static",
"Non-relocatable code"),
clEnumValN(Reloc::PIC_, "pic",
"Fully relocatable, position independent code"),
clEnumValN(Reloc::DynamicNoPIC, "dynamic-no-pic",
"Relocatable external references, non-relocatable code"),
clEnumValEnd));
cl::opt<ThreadModel::Model>
TMModel("thread-model",
cl::desc("Choose threading model"),
cl::init(ThreadModel::POSIX),
cl::values(clEnumValN(ThreadModel::POSIX, "posix",
"POSIX thread model"),
clEnumValN(ThreadModel::Single, "single",
"Single thread model"),
clEnumValEnd));
cl::opt<llvm::CodeModel::Model>
CMModel("code-model",
cl::desc("Choose code model"),
cl::init(CodeModel::Default),
cl::values(clEnumValN(CodeModel::Default, "default",
"Target default code model"),
clEnumValN(CodeModel::Small, "small",
"Small code model"),
clEnumValN(CodeModel::Kernel, "kernel",
"Kernel code model"),
clEnumValN(CodeModel::Medium, "medium",
"Medium code model"),
clEnumValN(CodeModel::Large, "large",
"Large code model"),
clEnumValEnd));
cl::opt<TargetMachine::CodeGenFileType>
FileType("filetype", cl::init(TargetMachine::CGFT_AssemblyFile),
cl::desc("Choose a file type (not all types are supported by all targets):"),
cl::values(
clEnumValN(TargetMachine::CGFT_AssemblyFile, "asm",
"Emit an assembly ('.s') file"),
clEnumValN(TargetMachine::CGFT_ObjectFile, "obj",
"Emit a native object ('.o') file"),
clEnumValN(TargetMachine::CGFT_Null, "null",
"Emit nothing, for performance testing"),
clEnumValEnd));
cl::opt<bool>
EnableFPMAD("enable-fp-mad",
cl::desc("Enable less precise MAD instructions to be generated"),
cl::init(false));
cl::opt<bool>
DisableFPElim("disable-fp-elim",
cl::desc("Disable frame pointer elimination optimization"),
cl::init(false));
cl::opt<bool>
EnableUnsafeFPMath("enable-unsafe-fp-math",
cl::desc("Enable optimizations that may decrease FP precision"),
cl::init(false));
cl::opt<bool>
EnableNoInfsFPMath("enable-no-infs-fp-math",
cl::desc("Enable FP math optimizations that assume no +-Infs"),
cl::init(false));
cl::opt<bool>
EnableNoNaNsFPMath("enable-no-nans-fp-math",
cl::desc("Enable FP math optimizations that assume no NaNs"),
cl::init(false));
cl::opt<bool>
EnableHonorSignDependentRoundingFPMath("enable-sign-dependent-rounding-fp-math",
cl::Hidden,
cl::desc("Force codegen to assume rounding mode can change dynamically"),
cl::init(false));
cl::opt<bool>
GenerateSoftFloatCalls("soft-float",
cl::desc("Generate software floating point library calls"),
cl::init(false));
cl::opt<llvm::FloatABI::ABIType>
FloatABIForCalls("float-abi",
cl::desc("Choose float ABI type"),
cl::init(FloatABI::Default),
cl::values(
clEnumValN(FloatABI::Default, "default",
"Target default float ABI type"),
clEnumValN(FloatABI::Soft, "soft",
"Soft float ABI (implied by -soft-float)"),
clEnumValN(FloatABI::Hard, "hard",
"Hard float ABI (uses FP registers)"),
clEnumValEnd));
cl::opt<llvm::FPOpFusion::FPOpFusionMode>
FuseFPOps("fp-contract",
cl::desc("Enable aggressive formation of fused FP ops"),
cl::init(FPOpFusion::Standard),
cl::values(
clEnumValN(FPOpFusion::Fast, "fast",
"Fuse FP ops whenever profitable"),
clEnumValN(FPOpFusion::Standard, "on",
"Only fuse 'blessed' FP ops."),
clEnumValN(FPOpFusion::Strict, "off",
"Only fuse FP ops when the result won't be effected."),
clEnumValEnd));
cl::opt<bool>
DontPlaceZerosInBSS("nozero-initialized-in-bss",
cl::desc("Don't place zero-initialized symbols into bss section"),
cl::init(false));
cl::opt<bool>
EnableGuaranteedTailCallOpt("tailcallopt",
cl::desc("Turn fastcc calls into tail calls by (potentially) changing ABI."),
cl::init(false));
cl::opt<bool>
DisableTailCalls("disable-tail-calls",
cl::desc("Never emit tail calls"),
cl::init(false));
cl::opt<unsigned>
OverrideStackAlignment("stack-alignment",
cl::desc("Override default stack alignment"),
cl::init(0));
cl::opt<std::string>
TrapFuncName("trap-func", cl::Hidden,
cl::desc("Emit a call to trap function rather than a trap instruction"),
cl::init(""));
cl::opt<bool>
EnablePIE("enable-pie",
cl::desc("Assume the creation of a position independent executable."),
cl::init(false));
cl::opt<bool>
UseCtors("use-ctors",
cl::desc("Use .ctors instead of .init_array."),
cl::init(false));
cl::opt<std::string> StopAfter("stop-after",
cl::desc("Stop compilation after a specific pass"),
cl::value_desc("pass-name"),
cl::init(""));
cl::opt<std::string> StartAfter("start-after",
cl::desc("Resume compilation after a specific pass"),
cl::value_desc("pass-name"),
cl::init(""));
cl::opt<bool> DataSections("data-sections",
cl::desc("Emit data into separate sections"),
cl::init(false));
cl::opt<bool>
FunctionSections("function-sections",
cl::desc("Emit functions into separate sections"),
cl::init(false));
cl::opt<bool> UniqueSectionNames("unique-section-names",
cl::desc("Give unique names to every section"),
cl::init(true));
cl::opt<llvm::JumpTable::JumpTableType>
JTableType("jump-table-type",
cl::desc("Choose the type of Jump-Instruction Table for jumptable."),
cl::init(JumpTable::Single),
cl::values(
clEnumValN(JumpTable::Single, "single",
"Create a single table for all jumptable functions"),
clEnumValN(JumpTable::Arity, "arity",
"Create one table per number of parameters."),
clEnumValN(JumpTable::Simplified, "simplified",
"Create one table per simplified function type."),
clEnumValN(JumpTable::Full, "full",
"Create one table per unique function type."),
clEnumValEnd));
cl::opt<bool>
FCFI("fcfi",
cl::desc("Apply forward-edge control-flow integrity"),
cl::init(false));
cl::opt<llvm::CFIntegrity>
CFIType("cfi-type",
cl::desc("Choose the type of Control-Flow Integrity check to add"),
cl::init(CFIntegrity::Sub),
cl::values(
clEnumValN(CFIntegrity::Sub, "sub",
"Subtract the pointer from the table base, then mask."),
clEnumValN(CFIntegrity::Ror, "ror",
"Use rotate to check the offset from a table base."),
clEnumValN(CFIntegrity::Add, "add",
"Mask out the high bits and add to an aligned base."),
clEnumValEnd));
cl::opt<bool>
CFIEnforcing("cfi-enforcing",
cl::desc("Enforce CFI or pass the violation to a function."),
cl::init(false));
// Note that this option is linked to the cfi-enforcing option above: if
// cfi-enforcing is set, then the cfi-func-name option is entirely ignored. If
// cfi-enforcing is false and no cfi-func-name is set, then a default function
// will be generated that ignores all CFI violations. The expected signature for
// functions called with CFI violations is
//
// void (i8*, i8*)
//
// The first pointer is a C string containing the name of the function in which
// the violation occurs, and the second pointer is the pointer that violated
// CFI.
cl::opt<std::string>
CFIFuncName("cfi-func-name", cl::desc("The name of the CFI function to call"),
cl::init(""));
// Common utility function tightly tied to the options listed here. Initializes
// a TargetOptions object with CodeGen flags and returns it.
static inline TargetOptions InitTargetOptionsFromCodeGenFlags() {
TargetOptions Options;
Options.LessPreciseFPMADOption = EnableFPMAD;
Options.NoFramePointerElim = DisableFPElim;
Options.AllowFPOpFusion = FuseFPOps;
Options.UnsafeFPMath = EnableUnsafeFPMath;
Options.NoInfsFPMath = EnableNoInfsFPMath;
Options.NoNaNsFPMath = EnableNoNaNsFPMath;
Options.HonorSignDependentRoundingFPMathOption =
EnableHonorSignDependentRoundingFPMath;
Options.UseSoftFloat = GenerateSoftFloatCalls;
if (FloatABIForCalls != FloatABI::Default)
Options.FloatABIType = FloatABIForCalls;
Options.NoZerosInBSS = DontPlaceZerosInBSS;
Options.GuaranteedTailCallOpt = EnableGuaranteedTailCallOpt;
Options.DisableTailCalls = DisableTailCalls;
Options.StackAlignmentOverride = OverrideStackAlignment;
Options.TrapFuncName = TrapFuncName;
Options.PositionIndependentExecutable = EnablePIE;
Options.UseInitArray = !UseCtors;
Options.DataSections = DataSections;
Options.FunctionSections = FunctionSections;
Options.UniqueSectionNames = UniqueSectionNames;
Options.MCOptions = InitMCTargetOptionsFromFlags();
Options.JTType = JTableType;
Options.FCFI = FCFI;
Options.CFIType = CFIType;
Options.CFIEnforcing = CFIEnforcing;
Options.CFIFuncName = CFIFuncName;
Options.ThreadModel = TMModel;
return Options;
}
#endif